X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/eb3a6cd62dc3b83c68ad174d4c439f5bbaa902e1..refs/heads/master:/ppp.c diff --git a/ppp.c b/ppp.c index cfd4f80..87ec0e8 100644 --- a/ppp.c +++ b/ppp.c @@ -1,12 +1,12 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.6 2004/06/28 02:43:13 fred_nerk Exp $"; - #include #include #include #include #include +#include +#include "dhcp6.h" #include "l2tpns.h" #include "constants.h" #include "plugin.h" @@ -14,93 +14,139 @@ char const *cvs_id_ppp = "$Id: ppp.c,v 1.6 2004/06/28 02:43:13 fred_nerk Exp $"; #include "tbf.h" #include "cluster.h" +#include "l2tplac.h" +#include "pppoe.h" + extern tunnelt *tunnel; +extern bundlet *bundle; +extern fragmentationt *frag; extern sessiont *session; extern radiust *radius; -extern int tapfd; +extern int tunfd; extern char hostname[]; -extern u32 eth_tx; +extern uint32_t eth_tx; extern time_t time_now; -extern struct configt *config; +extern uint64_t time_now_ms; +extern configt *config; -// Process PAP messages -void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l) +static int add_lcp_auth(uint8_t *b, int size, int authtype); +static bundleidt new_bundle(void); +static int epdiscmp(epdist, epdist); +static void setepdis(epdist *, epdist); +static void ipcp_open(sessionidt s, tunnelidt t); + +static int first_session_in_bundle(sessionidt s) { - char user[129]; - char pass[129]; + bundleidt i; + for (i = 1; i < MAXBUNDLE; i++) + if (bundle[i].state != BUNDLEFREE) + if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user)) + return 0; + return 1; +} +// Process PAP messages +void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + char user[MAXUSER]; + char pass[MAXPASS]; + uint16_t hl; + uint16_t r; - CSTAT(call_processpap); + CSTAT(processpap); - log_hex(5, "PAP", p, l); + LOG_HEX(5, "PAP", p, l); if (l < 4) { - log(1, 0, s, t, "Short PAP %u bytes\n", l); + LOG(1, s, t, "Short PAP %u bytes\n", l); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "Short PAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } - if (*p != 1) + + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { - log(1, 0, s, t, "Unexpected PAP code %d\n", *p); + LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "PAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } - if (ntohs(*(u16 *) (p + 2)) > l) + l = hl; + + if (*p != 1) { - log(1, 0, s, t, "Length mismatch PAP %d/%d\n", ntohs(*(u16 *) (p + 2)), l); + LOG(1, s, t, "Unexpected PAP code %d\n", *p); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "Unexpected PAP code.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } + + if (session[s].ppp.phase != Authenticate) + { + LOG(2, s, t, "PAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase)); + return; } + { - u8 *b = p; + uint8_t *b = p; b += 4; + user[0] = pass[0] = 0; if (*b && *b < sizeof(user)) + { memcpy(user, b + 1, *b); - user[*b] = 0; - b += 1 + *b; - if (*b && *b < sizeof(pass)) - memcpy(pass, b + 1, *b); - pass[*b] = 0; - log(3, 0, s, t, "PAP login %s/%s\n", user, pass); + user[*b] = 0; + b += 1 + *b; + if (*b && *b < sizeof(pass)) + { + memcpy(pass, b + 1, *b); + pass[*b] = 0; + } + } + LOG(3, s, t, "PAP login %s/%s\n", user, pass); + } + + if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, user)) + { + // Creating a tunnel/session has been started + return; } - if (session[s].ip || !session[s].radius) + + if (session[s].ip || !(r = radiusnew(s))) { // respond now, either no RADIUS available or already authenticated - u8 b[MAXCONTROL]; - u8 id = p[1]; - u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP); - if (!p) { // Failed to make ppp header! - log(1,0,0,0, "Failed to make PPP header in process pap!\n"); - return; - } + uint8_t b[MAXETHER]; + uint8_t id = p[1]; + uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0); + if (!p) return; + if (session[s].ip) - *p = 2; // ACK + *p = 2; // ACK else - *p = 3; // cant authorise + *p = 3; // cant authorise p[1] = id; - *(u16 *) (p + 2) = htons(5); // length - p[4] = 0; // no message + *(uint16_t *) (p + 2) = htons(5); // length + p[4] = 0; // no message + tunnelsend(b, 5 + (p - b), t); // send it + if (session[s].ip) { - log(3, session[s].ip, s, t, "%d Already an IP allocated: %s (%d)\n", getpid(), inet_toa(htonl(session[s].ip)), session[s].ip_pool_index); + LOG(3, s, t, "Already an IP allocated: %s (%d)\n", + fmtaddr(htonl(session[s].ip), 0), session[s].ip_pool_index); } else { - log(1, 0, s, t, "No radius session available to authenticate session...\n"); + LOG(1, s, t, "No RADIUS session available to authenticate session...\n"); + sessionshutdown(s, "No free RADIUS sessions.", CDN_UNAVAILABLE, TERM_SERVICE_UNAVAILABLE); } - log(3, 0, s, t, "Fallback response to PAP (%s)\n", (session[s].ip) ? "ACK" : "NAK"); - tunnelsend(b, 5 + (p - b), t); // send it } else - { // set up RADIUS request - u16 r = session[s].radius; - + { // Run PRE_AUTH plugins struct param_pre_auth packet = { &tunnel[t], &session[s], strdup(user), strdup(pass), PPPPAP, 1 }; run_plugins(PLUGIN_PRE_AUTH, &packet); if (!packet.continue_auth) { - log(3, 0, s, t, "A plugin rejected PRE_AUTH\n"); + LOG(3, s, t, "A plugin rejected PRE_AUTH\n"); if (packet.username) free(packet.username); if (packet.password) free(packet.password); return; @@ -113,76 +159,121 @@ void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l) free(packet.password); radius[r].id = p[1]; - log(3, 0, s, t, "Sending login for %s/%s to radius\n", user, pass); - radiussend(r, RADIUSAUTH); + LOG(3, s, t, "Sending login for %s/%s to RADIUS\n", user, pass); + if ((session[s].mrru) && (!first_session_in_bundle(s))) + radiussend(r, RADIUSJUSTAUTH); + else + radiussend(r, RADIUSAUTH); } } // Process CHAP messages -void processchap(tunnelidt t, sessionidt s, u8 * p, u16 l) +void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { - u16 r; - u16 len; + uint16_t r; + uint16_t hl; + CSTAT(processchap); - CSTAT(call_processchap); + LOG_HEX(5, "CHAP", p, l); - log_hex(5, "CHAP", p, l); - r = session[s].radius; - if (!r) + if (l < 4) { - log(1, 0, s, t, "Unexpected CHAP message\n"); - -// FIXME: Need to drop the session here. + LOG(1, s, t, "Short CHAP %u bytes\n", l); + STAT(tunnel_rx_errors); + sessionshutdown(s, "Short CHAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) + { + LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l); STAT(tunnel_rx_errors); + sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } + l = hl; + if (*p != 2) { - log(1, 0, s, t, "Unexpected CHAP response code %d\n", *p); + LOG(1, s, t, "Unexpected CHAP response code %d\n", *p); STAT(tunnel_rx_errors); + sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } - if (p[1] != radius[r].id) + + if (session[s].ppp.phase != Authenticate) { - log(1, 0, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r); - STAT(tunnel_rx_errors); - return ; + LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase)); + return; + } + + r = sess_local[s].radius; + if (!r) + { + LOG(3, s, t, "Unexpected CHAP message\n"); + + // Some modems (Netgear DM602, possibly others) persist in using CHAP even + // after ACKing our ConfigReq for PAP. + if (sess_local[s].lcp_authtype == AUTHPAP && config->radius_authtypes & AUTHCHAP) + { + sess_local[s].lcp_authtype = AUTHCHAP; + sendchap(s, t); + } + return; } - len = ntohs(*(u16 *) (p + 2)); - if (len > l) + + if (p[1] != radius[r].id) { - log(1, 0, s, t, "Bad CHAP length %d\n", len); + LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "Unexpected CHAP response ID.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } - if (p[4] != 16) + + if (l < 5 || p[4] != 16) { - log(1, 0, s, t, "Bad CHAP response length %d\n", p[4]); + LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "Bad CHAP response length.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } - if (len - 21 >= sizeof(session[s].user)) + + l -= 5; + p += 5; + if (l < 16 || l - 16 >= sizeof(session[s].user)) { - log(1, 0, s, t, "CHAP user too long %d\n", len - 21); + LOG(1, s, t, "CHAP user too long %d\n", l - 16); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "CHAP username too long.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } // Run PRE_AUTH plugins { struct param_pre_auth packet = { &tunnel[t], &session[s], NULL, NULL, PPPCHAP, 1 }; - packet.username = calloc(len-20, 1); - packet.password = calloc(16, 1); - memcpy(packet.username, p + 21, len - 21); - memcpy(packet.password, p + 5, 16); + packet.password = calloc(17, 1); + memcpy(packet.password, p, 16); + + p += 16; + l -= 16; + + packet.username = calloc(l + 1, 1); + memcpy(packet.username, p, l); + + if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, packet.username)) + { + free(packet.username); + free(packet.password); + // Creating a tunnel/session has been started + return; + } run_plugins(PLUGIN_PRE_AUTH, &packet); if (!packet.continue_auth) { - log(3, 0, s, t, "A plugin rejected PRE_AUTH\n"); + LOG(3, s, t, "A plugin rejected PRE_AUTH\n"); if (packet.username) free(packet.username); if (packet.password) free(packet.password); return; @@ -196,33 +287,21 @@ void processchap(tunnelidt t, sessionidt s, u8 * p, u16 l) } radius[r].chap = 1; - log(3, 0, s, t, "CHAP login %s\n", session[s].user); - radiussend(r, RADIUSAUTH); + LOG(3, s, t, "CHAP login %s\n", session[s].user); + if ((session[s].mrru) && (!first_session_in_bundle(s))) + radiussend(r, RADIUSJUSTAUTH); + else + radiussend(r, RADIUSAUTH); } -char *ppp_lcp_types[] = { - NULL, - "ConfigReq", - "ConfigAck", - "ConfigNak", - "ConfigRej", - "TerminateReq", - "TerminateAck", - "CodeRej", - "ProtocolRej", - "EchoReq", - "EchoReply", - "DiscardRequest", -}; - -void dumplcp(u8 *p, int l) +static void dumplcp(uint8_t *p, int l) { - signed int x = l - 4; - u8 *o = (p + 4); + int x = l - 4; + uint8_t *o = (p + 4); - log_hex(5, "PPP LCP Packet", p, l); - log(4, 0, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) ); - log(4, 0, 0, 0, "Length: %d\n", l); + LOG_HEX(5, "PPP LCP Packet", p, l); + LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_code((int)*p), ntohs( ((uint16_t *) p)[1]) ); + LOG(4, 0, 0, "Length: %d\n", l); if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck) return; @@ -230,14 +309,14 @@ void dumplcp(u8 *p, int l) { int type = o[0]; int length = o[1]; - if (length == 0) + if (length < 2) { - log(4, 0, 0, 0, " Option length is 0...\n"); + LOG(4, 0, 0, " Option length is %d...\n", length); break; } if (type == 0) { - log(4, 0, 0, 0, " Option type is 0...\n"); + LOG(4, 0, 0, " Option type is 0...\n"); x -= length; o += length; continue; @@ -245,41 +324,58 @@ void dumplcp(u8 *p, int l) switch (type) { case 1: // Maximum-Receive-Unit - log(4, 0, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2))); + if (length == 4) + LOG(4, 0, 0, " %s %d\n", ppp_lcp_option(type), ntohs(*(uint16_t *)(o + 2))); + else + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); + break; + case 2: // Async-Control-Character-Map + if (length == 6) + { + uint32_t asyncmap = ntohl(*(uint32_t *)(o + 2)); + LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), asyncmap); + } + else + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); break; case 3: // Authentication-Protocol + if (length == 4) { - int proto = ntohs(*(u16 *)(o + 2)); - log(4, 0, 0, 0, " %s %s\n", lcp_types[type], - proto == 0xC223 ? "CHAP" : "PAP"); - break; + int proto = ntohs(*(uint16_t *)(o + 2)); + LOG(4, 0, 0, " %s 0x%x (%s)\n", ppp_lcp_option(type), proto, + proto == PPPPAP ? "PAP" : "UNSUPPORTED"); + } + else if (length == 5) + { + int proto = ntohs(*(uint16_t *)(o + 2)); + int algo = *(o + 4); + LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", ppp_lcp_option(type), proto, algo, + (proto == PPPCHAP && algo == 5) ? "CHAP MD5" : "UNSUPPORTED"); } + else + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); + break; case 4: // Quality-Protocol { - u32 qp = ntohl(*(u32 *)(o + 2)); - log(4, 0, 0, 0, " %s %x\n", lcp_types[type], qp); - break; + uint32_t qp = ntohl(*(uint32_t *)(o + 2)); + LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), qp); } + break; case 5: // Magic-Number + if (length == 6) { - u32 magicno = ntohl(*(u32 *)(o + 2)); - log(4, 0, 0, 0, " %s %x\n", lcp_types[type], magicno); - break; + uint32_t magicno = ntohl(*(uint32_t *)(o + 2)); + LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), magicno); } + else + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); + break; case 7: // Protocol-Field-Compression - { - u32 pfc = ntohl(*(u32 *)(o + 2)); - log(4, 0, 0, 0, " %s %x\n", lcp_types[type], pfc); - break; - } case 8: // Address-And-Control-Field-Compression - { - u32 afc = ntohl(*(u32 *)(o + 2)); - log(4, 0, 0, 0, " %s %x\n", lcp_types[type], afc); - break; - } + LOG(4, 0, 0, " %s\n", ppp_lcp_option(type)); + break; default: - log(2, 0, 0, 0, " Unknown PPP LCP Option type %d\n", type); + LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type); break; } x -= length; @@ -287,346 +383,1942 @@ void dumplcp(u8 *p, int l) } } -// Process LCP messages -void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l) +void lcp_open(sessionidt s, tunnelidt t) { - u8 b[MAXCONTROL]; - u8 *q = NULL; + // transition to Authentication or Network phase: + session[s].ppp.phase = sess_local[s].lcp_authtype ? Authenticate : Network; + LOG(3, s, t, "LCP: Opened, phase %s\n", ppp_phase(session[s].ppp.phase)); - CSTAT(call_processlcp); + // LCP now Opened + change_state(s, lcp, Opened); - log_hex(5, "LCP", p, l); - if (l < 4) - { - log(1, session[s].ip, s, t, "Short LCP %d bytes\n", l); - STAT(tunnel_rx_errors); - return ; - } - if (*p == ConfigAck) + if (session[s].ppp.phase == Authenticate) { - log(3, session[s].ip, s, t, "LCP: Discarding ConfigAck\n"); + if (sess_local[s].lcp_authtype == AUTHCHAP) + sendchap(s, t); } - else if (*p == ConfigReq) + else { - signed int x = l - 4; - u8 *o = (p + 4); - - log(3, session[s].ip, s, t, "LCP: ConfigReq (%d bytes)...\n", l); - dumplcp(p, l); - - while (x > 2) + if(session[s].bundle == 0 || bundle[session[s].bundle].num_of_links == 1) { - int type = o[0]; - int length = o[1]; - if (length == 0 || type == 0) break; - switch (type) - { - case 1: // Maximum-Receive-Unit - session[s].mru = ntohs(*(u16 *)(o + 2)); - break; - case 3: // Authentication-Protocol - { - int proto = ntohs(*(u16 *)(o + 2)); - if (proto == 0xC223) - { - log(2, session[s].ip, s, t, " Remote end is trying to do CHAP. Rejecting it.\n"); - - if (!q) - { - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); - if (!q) { - log(2, session[s].ip, s, t, " Failed to send packet.\n"); - break; - } - *q++ = ConfigNak; - } - memcpy(q, o, length); - *(u16 *)(q += 2) = htons(0xC023); // NAK -> Use PAP instead - q += length; - } - break; - } - case 5: // Magic-Number - { -// u32 magicno = ntohl(*(u32 *)(o + 2)); - break; - } - case 4: // Quality-Protocol - { -// u32 qp = ntohl(*(u32 *)(o + 2)); - break; - } - case 7: // Protocol-Field-Compression - { -// u32 pfc = ntohl(*(u32 *)(o + 2)); - break; - } - case 8: // Address-And-Control-Field-Compression - { -// u32 afc = ntohl(*(u32 *)(o + 2)); - break; - } - default: - log(2, session[s].ip, s, t, " Unknown PPP LCP Option type %d\n", type); - break; - } - x -= length; - o += length; - } + // This-Layer-Up + sendipcp(s, t); + change_state(s, ipcp, RequestSent); + // move to passive state for IPv6 (if configured), CCP + if (config->ipv6_prefix.s6_addr[0]) + change_state(s, ipv6cp, Stopped); + else + change_state(s, ipv6cp, Closed); - if (!q) - { - // Send back a ConfigAck - log(3, session[s].ip, s, t, "ConfigReq accepted, sending as Ack\n"); - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); - if (!q) { - log(3, session[s].ip, s, t, " failed to create packet.\n"); - return; - } - *q = ConfigAck; - tunnelsend(b, l + (q - b), t); + change_state(s, ccp, Stopped); } else { - // Already built a ConfigNak... send it - log(3, session[s].ip, s, t, "Sending ConfigNak\n"); - tunnelsend(b, l + (q - b), t); - - log(3, session[s].ip, s, t, "Sending ConfigReq, requesting PAP login\n"); - q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP); - *q++ = ConfigReq; - *(u8 *)(q++) = 3; - *(u8 *)(q++) = 4; - *(u16 *)(q += 2) = htons(0xC023); - tunnelsend(b, l + (q - b), t); - } - } - else if (*p == ConfigNak) - { - log(1, session[s].ip, s, t, "Remote end sent a ConfigNak. Ignoring\n"); - dumplcp(p, l); - return ; - } - else if (*p == TerminateReq) - { - *p = TerminateAck; // close - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); - if (!q) { - log(3, session[s].ip, s, t, "Failed to create PPP packet in processlcp.\n"); - return; - } - log(3, session[s].ip, s, t, "LCP: Received TerminateReq. Sending TerminateAck\n"); - sessionshutdown(s, "Remote end closed connection."); - tunnelsend(b, l + (q - b), t); // send it - } - else if (*p == TerminateReq) - { - sessionshutdown(s, "Remote end closed connection."); - } - else if (*p == EchoReq) - { - *p = EchoReply; // reply - *(u32 *) (p + 4) = htonl(session[s].magic); // our magic number - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); - if (!q) { - log(3, session[s].ip, s, t, " failed to send EchoReply.\n"); - return; - } - log(5, session[s].ip, s, t, "LCP: Received EchoReq. Sending EchoReply\n"); - tunnelsend(b, l + (q - b), t); // send it + sessionidt first_ses = bundle[session[s].bundle].members[0]; + LOG(3, s, t, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n",s,first_ses); + ipcp_open(s, t); + } } - else if (*p == EchoReply) +} + +void lcp_restart(sessionidt s) +{ + session[s].ppp.phase = Establish; + // This-Layer-Down + change_state(s, ipcp, Dead); + change_state(s, ipv6cp, Dead); + change_state(s, ccp, Dead); +} + +static uint8_t *ppp_conf_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, + uint8_t **response, uint8_t *queued, uint8_t *packet, uint8_t *option) +{ + if (!*response || **response != ConfigRej) { - // Ignore it, last_packet time is set earlier than this. + queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0); + if (!queued) + return 0; + + *queued = ConfigRej; + queued += 4; } - else + + if ((queued - buf + option[1]) > blen) { - log(1, session[s].ip, s, t, "Unexpected LCP code %d\n", *p); - STAT(tunnel_rx_errors); - return ; + LOG(2, s, session[s].tunnel, "PPP overflow for ConfigRej (proto %u, option %u).\n", mtype, *option); + return 0; } + + memcpy(queued, option, option[1]); + return queued + option[1]; } -// Process IPCP messages -void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l) +static uint8_t *ppp_conf_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, + uint8_t **response, uint8_t *queued, uint8_t *packet, uint8_t *option, + uint8_t *value, size_t vlen) { - - CSTAT(call_processipcp); - - log_hex(5, "IPCP", p, l); - if (l < 5) + int *nak_sent; + switch (mtype) { - log(1, 0, s, t, "Short IPCP %d bytes\n", l); - STAT(tunnel_rx_errors); - return ; + case PPPLCP: nak_sent = &sess_local[s].lcp.nak_sent; break; + case PPPIPCP: nak_sent = &sess_local[s].ipcp.nak_sent; break; + case PPPIPV6CP: nak_sent = &sess_local[s].ipv6cp.nak_sent; break; + default: return 0; // ? } - if (*p == ConfigAck) - { // happy with our IPCP - u16 r = session[s].radius; - if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden) { - if (!r) - r = radiusnew(s); - if (r) - radiussend(r, RADIUSSTART); // send radius start, having got IPCP at last - } - session[s].flags |= SF_IPCP_ACKED; - return ; // done - } - if (*p != ConfigReq) + if (*response && **response != ConfigNak) { - log(1, 0, s, t, "Unexpected IPCP code %d\n", *p); - STAT(tunnel_rx_errors); - return ; + if (*nak_sent < config->ppp_max_failure) // reject queued + return queued; + + return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option); } - if (ntohs(*(u16 *) (p + 2)) > l) + + if (!*response) { - log(1, 0, s, t, "Length mismatch IPCP %d/%d\n", ntohs(*(u16 *) (p + 2)), l); - STAT(tunnel_rx_errors); - return ; + if (*nak_sent >= config->ppp_max_failure) + return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option); + + queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0); + if (!queued) + return 0; + + (*nak_sent)++; + *queued = ConfigNak; + queued += 4; } - if (!session[s].ip) + + if ((queued - buf + vlen + 2) > blen) { - log(3, 0, s, t, "Waiting on radius reply\n"); - return ; // have to wait on RADIUS reply + LOG(2, s, session[s].tunnel, "PPP overflow for ConfigNak (proto %u, option %u).\n", mtype, *option); + return 0; } - // form a config reply quoting the IP in the session - { - u8 b[MAXCONTROL]; - u8 *i, - *q; - q = p + 4; - i = p + l; - while (q < i && q[1]) - { - if (*q != 0x81 && *q != 0x83 && *q != 3) - break; - q += q[1]; - } - if (q < i) - { // reject - u16 n = 4; - i = p + l; - q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP); - if (!q) { - log(2, 0, s, t, "Failed to send IPCP.\n"); - return; - } - *q = ConfigRej; - p += 4; - while (p < i && p[1]) - { - if (*p != 0x81 && *p != 0x83 && *p != 3) - { - log(2, 0, s, t, "IPCP reject %d\n", *p); - memcpy(q + n, p, p[1]); - n += p[1]; - } - p += p[1]; - } - *(u16 *) (q + 2) = htons(n); - tunnelsend(b, n + (q - b), t); // send it - } - else - { - *p = ConfigAck; - i = findppp(p, 0x81); // Primary DNS address - if (i) - { - if (*(u32 *) (i + 2) != htonl(session[s].dns1)) - { - *(u32 *) (i + 2) = htonl(session[s].dns1); - *p = ConfigNak; - } - } - i = findppp(p, 0x83); // Secondary DNS address (TBA, is it) - if (i) - { - if (*(u32 *) (i + 2) != htonl(session[s].dns2)) - { - *(u32 *) (i + 2) = htonl(session[s].dns2); - *p = ConfigNak; - } - } - i = findppp(p, 3); // IP address - if (!i || i[1] != 6) - { - log(1, 0, s, t, "No IP in IPCP request\n"); - STAT(tunnel_rx_errors); - return ; - } - if (*(u32 *) (i + 2) != htonl(session[s].ip)) - { - *(u32 *) (i + 2) = htonl(session[s].ip); - *p = ConfigNak; - } - q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP); - if (!q) { - log(2, 0, s, t, " Failed to send IPCP packet.\n"); - return; - } - tunnelsend(b, l + (q - b), t); // send it - } - } + *queued++ = *option; + *queued++ = vlen + 2; + memcpy(queued, value, vlen); + return queued + vlen; } -// process IP packet received -// -// This MUST be called with at least 4 byte behind 'p'. -// (i.e. this routine writes to p[-4]). -void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l) +static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto, + char *pname, uint8_t *p, uint16_t l, uint8_t *buf, size_t size) { - ipt ip; + uint8_t *q; + int mru = session[s].mru; + if (mru < MINMTU) mru = MINMTU; + if (mru > size) mru = size; + l += 4; + if (l > mru) l = mru; - CSTAT(call_processipin); + q = makeppp(buf, size, 0, 0, s, t, proto, 0, 0, 0); + if (!q) return; - log_hex(5, "IP", p, l); + *q = CodeRej; + *(q + 1) = ++sess_local[s].lcp_ident; + *(uint16_t *)(q + 2) = htons(l); + memcpy(q + 4, p, l - 4); - ip = ntohl(*(u32 *)(p + 12)); + LOG(2, s, t, "Unexpected %s code %s\n", pname, ppp_code(*p)); + LOG(3, s, t, "%s: send %s\n", pname, ppp_code(*q)); + if (config->debug > 3) dumplcp(q, l); - if (l > MAXETHER) + tunnelsend(buf, l + (q - buf), t); +} + +// Process LCP messages +void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + uint8_t b[MAXETHER]; + uint8_t *q = NULL; + uint16_t hl; + + CSTAT(processlcp); + + LOG_HEX(5, "LCP", p, l); + if (l < 4) { - log(1, ip, s, t, "IP packet too long %d\n", l); + LOG(1, s, t, "Short LCP %d bytes\n", l); STAT(tunnel_rx_errors); return ; } - // no spoof (do sessionbyip to handled statically routed subnets) - if (ip != session[s].ip && sessionbyip(htonl(ip)) != s) + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { - log(5, ip, s, t, "Dropping packet with spoofed IP %s\n", inet_toa(htonl(ip))); - return; + LOG(1, s, t, "Length mismatch LCP %u/%u\n", hl, l); + STAT(tunnel_rx_errors); + return ; } + l = hl; - // Add on the tun header - p -= 4; - *(u32 *)p = htonl(0x00000800); - l += 4; - - if (session[s].tbf_in && !config->cluster_iam_master) { // Are we throttled and a slave? - master_throttle_packet(session[s].tbf_in, p, l); // Pass it to the master for handling. + if (session[s].die) // going down... return; - } - session[s].cin += l - 4; - session[s].total_cin += l - 4; - sess_count[s].cin += l - 4; + LOG(((*p == EchoReq || *p == EchoReply) ? 4 : 3), s, t, + "LCP: recv %s\n", ppp_code(*p)); - session[s].pin++; - eth_tx += l - 4; + if (config->debug > 3) dumplcp(p, l); + + if (*p == ConfigAck) + { + int x = l - 4; + uint8_t *o = (p + 4); + int authtype = 0; + + while (x > 2) + { + int type = o[0]; + int length = o[1]; + + if (length == 0 || type == 0 || x < length) break; + switch (type) + { + case 3: // Authentication-Protocol + { + int proto = ntohs(*(uint16_t *)(o + 2)); + if (proto == PPPPAP) + authtype = AUTHPAP; + else if (proto == PPPCHAP && *(o + 4) == 5) + authtype = AUTHCHAP; + } + + break; + } + x -= length; + o += length; + } + + if (!session[s].ip && authtype) + sess_local[s].lcp_authtype = authtype; + + switch (session[s].ppp.lcp) + { + case RequestSent: + initialise_restart_count(s, lcp); + change_state(s, lcp, AckReceived); + break; + + case AckReceived: + case Opened: + LOG(2, s, t, "LCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp)); + if (session[s].ppp.lcp == Opened) + lcp_restart(s); + + sendlcp(s, t); + change_state(s, lcp, RequestSent); + break; + + case AckSent: + lcp_open(s, t); + break; + + default: + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + } + } + else if (*p == ConfigReq) + { + int x = l - 4; + uint8_t *o = (p + 4); + uint8_t *response = 0; + static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero + static uint8_t authproto[5]; + int changed = 0; + + while (x > 2) + { + int type = o[0]; + int length = o[1]; + + if (length == 0 || type == 0 || x < length) break; + switch (type) + { + case 1: // Maximum-Receive-Unit + { + uint16_t mru = ntohs(*(uint16_t *)(o + 2)); + if (mru >= MINMTU) + { + session[s].mru = mru; + changed++; + break; + } + + LOG(3, s, t, " Remote requesting MRU of %u. Rejecting.\n", mru); + mru = htons(MRU); + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, (uint8_t *) &mru, sizeof(mru)); + } + break; + + case 2: // Async-Control-Character-Map + if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK + break; + + LOG(3, s, t, " Remote requesting asyncmap. Rejecting.\n"); + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap)); + break; + + case 3: // Authentication-Protocol + { + int proto = ntohs(*(uint16_t *)(o + 2)); + char proto_name[] = "0x0000"; + int alen; + + if (proto == PPPPAP) + { + if (config->radius_authtypes & AUTHPAP) + { + sess_local[s].lcp_authtype = AUTHPAP; + break; + } + + strcpy(proto_name, "PAP"); + } + else if (proto == PPPCHAP) + { + if (config->radius_authtypes & AUTHCHAP + && *(o + 4) == 5) // MD5 + { + sess_local[s].lcp_authtype = AUTHCHAP; + break; + } + + strcpy(proto_name, "CHAP"); + } + else + sprintf(proto_name, "%#4.4x", proto); + + LOG(3, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name); + + alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authprefer); + if (alen < 2) break; // paranoia + + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2); + if (q && *response == ConfigNak && + config->radius_authtypes != config->radius_authprefer) + { + // alternate type + alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authtypes & ~config->radius_authprefer); + if (alen < 2) break; + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2); + } + + break; + } + break; + + case 4: // Quality-Protocol + case 5: // Magic-Number + case 7: // Protocol-Field-Compression + case 8: // Address-And-Control-Field-Compression + break; + + case 17: // Multilink Max-Receive-Reconstructed-Unit + { + uint16_t mrru = ntohs(*(uint16_t *)(o + 2)); + session[s].mrru = mrru; + changed++; + LOG(3, s, t, " Received PPP LCP option MRRU: %d\n",mrru); + } + break; + + case 18: // Multilink Short Sequence Number Header Format + { + session[s].mssf = 1; + changed++; + LOG(3, s, t, " Received PPP LCP option MSSN format\n"); + } + break; + + case 19: // Multilink Endpoint Discriminator + { + uint8_t epdis_class = o[2]; + int addr; + + session[s].epdis.addr_class = epdis_class; + session[s].epdis.length = length - 3; + if (session[s].epdis.length > 20) + { + LOG(1, s, t, "Error: received EndDis Address Length more than 20: %d\n", session[s].epdis.length); + session[s].epdis.length = 20; + } + + for (addr = 0; addr < session[s].epdis.length; addr++) + session[s].epdis.address[addr] = o[3+addr]; + + changed++; + + switch (epdis_class) + { + case LOCALADDR: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis Local Address Class: %d\n",epdis_class); + break; + case IPADDR: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis IP Address Class: %d\n",epdis_class); + break; + case IEEEMACADDR: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis IEEE MAC Address Class: %d\n",epdis_class); + break; + case PPPMAGIC: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis PPP Magic No Class: %d\n",epdis_class); + break; + case PSNDN: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis PSND No Class: %d\n",epdis_class); + break; + default: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis NULL Class %d\n",epdis_class); + } + } + break; + + default: // Reject any unknown options + LOG(3, s, t, " Rejecting unknown PPP LCP option %d\n", type); + q = ppp_conf_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o); + } + x -= length; + o += length; + } + + if (changed) + cluster_send_session(s); + + if (response) + { + l = q - response; // LCP packet length + *((uint16_t *) (response + 2)) = htons(l); // update header + } + else + { + // Send packet back as ConfigAck + response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0); + if (!response) return; + *response = ConfigAck; + } + + switch (session[s].ppp.lcp) + { + case Closed: + response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0); + if (!response) return; + *response = TerminateAck; + *((uint16_t *) (response + 2)) = htons(l = 4); + break; + + case Stopped: + initialise_restart_count(s, lcp); + sendlcp(s, t); + if (*response == ConfigAck) + change_state(s, lcp, AckSent); + else + change_state(s, lcp, RequestSent); + + break; + + case RequestSent: + if (*response == ConfigAck) + change_state(s, lcp, AckSent); + + break; + + case AckReceived: + if (*response == ConfigAck) + lcp_open(s, t); + + break; + + case Opened: + lcp_restart(s); + sendlcp(s, t); + /* fallthrough */ + + case AckSent: + if (*response == ConfigAck) + change_state(s, lcp, AckSent); + else + change_state(s, lcp, RequestSent); + + break; + + case Closing: + sessionshutdown(s, "LCP: ConfigReq in state Closing. This should not happen. Killing session.", CDN_ADMIN_DISC, TERM_LOST_SERVICE); + break; + + default: + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + return; + } + + LOG(3, s, t, "LCP: send %s\n", ppp_code(*response)); + if (config->debug > 3) dumplcp(response, l); + + tunnelsend(b, l + (response - b), t); + } + else if (*p == ConfigNak || *p == ConfigRej) + { + int x = l - 4; + uint8_t *o = (p + 4); + int authtype = -1; + + while (x > 2) + { + int type = o[0]; + int length = o[1]; + + if (length == 0 || type == 0 || x < length) break; + switch (type) + { + case 1: // Maximum-Receive-Unit + if (*p == ConfigNak) + { + if (length < 4) break; + sess_local[s].ppp_mru = ntohs(*(uint16_t *)(o + 2)); + LOG(3, s, t, " Remote requested MRU of %u\n", sess_local[s].ppp_mru); + } + else + { + sess_local[s].ppp_mru = 0; + LOG(3, s, t, " Remote rejected MRU negotiation\n"); + } + + break; + + case 3: // Authentication-Protocol + if (authtype > 0) + break; + + if (*p == ConfigNak) + { + int proto; + + if (length < 4) break; + proto = ntohs(*(uint16_t *)(o + 2)); + + if (proto == PPPPAP) + { + authtype = config->radius_authtypes & AUTHPAP; + LOG(3, s, t, " Remote requested PAP authentication...%sing\n", + authtype ? "accept" : "reject"); + } + else if (proto == PPPCHAP && length > 4 && *(o + 4) == 5) + { + authtype = config->radius_authtypes & AUTHCHAP; + LOG(3, s, t, " Remote requested CHAP authentication...%sing\n", + authtype ? "accept" : "reject"); + } + else + { + LOG(3, s, t, " Rejecting unsupported authentication %#4x\n", + proto); + } + } + else + { + LOG(2, s, t, "LCP: remote rejected auth negotiation\n"); + authtype = 0; // shutdown + } + + break; + + case 5: // Magic-Number + session[s].magic = 0; + if (*p == ConfigNak) + { + if (length < 6) break; + session[s].magic = ntohl(*(uint32_t *)(o + 2)); + } + + if (session[s].magic) + LOG(3, s, t, " Remote requested magic-no %x\n", session[s].magic); + else + LOG(3, s, t, " Remote rejected magic-no\n"); + + cluster_send_session(s); + break; + + case 17: // Multilink Max-Receive-Reconstructed-Unit + { + if (*p == ConfigNak) + { + sess_local[s].mp_mrru = ntohs(*(uint16_t *)(o + 2)); + LOG(3, s, t, " Remote requested MRRU of %u\n", sess_local[s].mp_mrru); + } + else + { + sess_local[s].mp_mrru = 0; + LOG(3, s, t, " Remote rejected MRRU negotiation\n"); + } + } + break; + + case 18: // Multilink Short Sequence Number Header Format + { + if (*p == ConfigNak) + { + sess_local[s].mp_mssf = 0; + LOG(3, s, t, " Remote requested Naked mssf\n"); + } + else + { + sess_local[s].mp_mssf = 0; + LOG(3, s, t, " Remote rejected mssf\n"); + } + } + break; + + case 19: // Multilink Endpoint Discriminator + { + if (*p == ConfigNak) + { + LOG(2, s, t, " Remote should not configNak Endpoint Dis!\n"); + } + else + { + sess_local[s].mp_epdis = 0; + LOG(3, s, t, " Remote rejected Endpoint Discriminator\n"); + } + } + break; + + default: + LOG(2, s, t, "LCP: remote sent %s for type %u?\n", ppp_code(*p), type); + sessionshutdown(s, "Unable to negotiate LCP.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } + x -= length; + o += length; + } + + if (!authtype) + { + sessionshutdown(s, "Unsupported authentication.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } + + if (authtype > 0) + sess_local[s].lcp_authtype = authtype; + + switch (session[s].ppp.lcp) + { + case Closed: + case Stopped: + { + uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0); + if (!response) return; + *response = TerminateAck; + *((uint16_t *) (response + 2)) = htons(l = 4); + + LOG(3, s, t, "LCP: send %s\n", ppp_code(*response)); + if (config->debug > 3) dumplcp(response, l); + + tunnelsend(b, l + (response - b), t); + } + break; + + case RequestSent: + case AckSent: + initialise_restart_count(s, lcp); + sendlcp(s, t); + break; + + case AckReceived: + LOG(2, s, t, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp)); + sendlcp(s, t); + break; + + case Opened: + lcp_restart(s); + sendlcp(s, t); + break; + + default: + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + return; + } + } + else if (*p == TerminateReq) + { + switch (session[s].ppp.lcp) + { + case Closed: + case Stopped: + case Closing: + case Stopping: + case RequestSent: + case AckReceived: + case AckSent: + break; + + case Opened: + lcp_restart(s); + zero_restart_count(s, lcp); + change_state(s, lcp, Closing); + break; + + default: + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + return; + } + + *p = TerminateAck; // send ack + q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0); + if (!q) return; + + LOG(3, s, t, "LCP: send %s\n", ppp_code(*q)); + if (config->debug > 3) dumplcp(q, l); + + tunnelsend(b, l + (q - b), t); // send it + } + else if (*p == ProtocolRej) + { + uint16_t proto = 0; + + if (l > 4) + { + proto = *(p+4); + if (l > 5 && !(proto & 1)) + { + proto <<= 8; + proto |= *(p+5); + } + } + + if (proto == PPPIPV6CP) + { + LOG(3, s, t, "IPv6 rejected\n"); + change_state(s, ipv6cp, Closed); + } + else + { + LOG(3, s, t, "LCP protocol reject: 0x%04X\n", proto); + } + } + else if (*p == EchoReq) + { + *p = EchoReply; // reply + *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number + q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0); + if (!q) return; + + LOG(4, s, t, "LCP: send %s\n", ppp_code(*q)); + if (config->debug > 3) dumplcp(q, l); + + tunnelsend(b, l + (q - b), t); // send it + + if (session[s].ppp.phase == Network && session[s].ppp.ipv6cp == Opened) + send_ipv6_ra(s, t, NULL); // send a RA + } + else if (*p == EchoReply) + { + // Ignore it, last_packet time is set earlier than this. + } + else if (*p != CodeRej) + { + ppp_code_rej(s, t, PPPLCP, "LCP", p, l, b, sizeof(b)); + } +} + +int join_bundle(sessionidt s) +{ + // Search for a bundle to join + bundleidt i; + bundleidt b; + for (i = 1; i < MAXBUNDLE; i++) + { + if (bundle[i].state != BUNDLEFREE) + { + if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user)) + { + sessionidt first_ses = bundle[i].members[0]; + if (bundle[i].mssf != session[s].mssf) + { + // uniformity of sequence number format must be insured + LOG(3, s, session[s].tunnel, "MPPP: unable to bundle session %d in bundle %d cause of different mssf\n", s, i); + return -1; + } + session[s].bundle = i; + session[s].ip = session[first_ses].ip; + session[s].dns1 = session[first_ses].dns1; + session[s].dns2 = session[first_ses].dns2; + session[s].timeout = session[first_ses].timeout; + + if(session[s].epdis.length > 0) + setepdis(&bundle[i].epdis, session[s].epdis); + + strcpy(bundle[i].user, session[s].user); + bundle[i].members[bundle[i].num_of_links] = s; + bundle[i].num_of_links++; + LOG(3, s, session[s].tunnel, "MPPP: Bundling additional line in bundle (%d), lines:%d\n",i,bundle[i].num_of_links); + return i; + } + } + } + + // No previously created bundle was found for this session, so create a new one + if (!(b = new_bundle())) return 0; + + session[s].bundle = b; + bundle[b].mrru = session[s].mrru; + bundle[b].mssf = session[s].mssf; + // FIXME !!! to enable l2tpns reading mssf frames receiver_max_seq, sender_max_seq must be introduce + // now session[s].mssf flag indecates that the receiver wish to receive frames in mssf, so max_seq (i.e. recv_max_seq) = 1<<24 + /* + if (bundle[b].mssf) + bundle[b].max_seq = 1 << 12; + else */ + bundle[b].max_seq = 1 << 24; + if(session[s].epdis.length > 0) + setepdis(&bundle[b].epdis, session[s].epdis); + + strcpy(bundle[b].user, session[s].user); + bundle[b].members[0] = s; + bundle[b].timeout = session[s].timeout; + LOG(3, s, session[s].tunnel, "MPPP: Created a new bundle (%d)\n", b); + return b; +} + +static int epdiscmp(epdist ep1, epdist ep2) +{ + int ad; + if (ep1.length != ep2.length) + return 0; + + if (ep1.addr_class != ep2.addr_class) + return 0; + + for (ad = 0; ad < ep1.length; ad++) + if (ep1.address[ad] != ep2.address[ad]) + return 0; + + return 1; +} + +static void setepdis(epdist *ep1, epdist ep2) +{ + int ad; + ep1->length = ep2.length; + ep1->addr_class = ep2.addr_class; + for (ad = 0; ad < ep2.length; ad++) + ep1->address[ad] = ep2.address[ad]; +} + +static bundleidt new_bundle() +{ + bundleidt i; + for (i = 1; i < MAXBUNDLE; i++) + { + if (bundle[i].state == BUNDLEFREE) + { + LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i); + bundle[i].num_of_links = 1; + bundle[i].last_check = time_now; // Initialize last_check value + bundle[i].state = BUNDLEOPEN; + bundle[i].current_ses = -1; // This is to enforce the first session 0 to be used at first + memset(&frag[i], 0, sizeof(fragmentationt)); + if (i > config->cluster_highest_bundleid) + config->cluster_highest_bundleid = i; + return i; + } + } + LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n"); + return 0; +} + +static void ipcp_open(sessionidt s, tunnelidt t) +{ + LOG(3, s, t, "IPCP: Opened, session is now active\n"); + + change_state(s, ipcp, Opened); + + if (!(session[s].walled_garden || session[s].flags & SESSION_STARTED)) + { + uint16_t r = radiusnew(s); + if (r) + { + radiussend(r, RADIUSSTART); // send radius start + + // don't send further Start records if IPCP is restarted + session[s].flags |= SESSION_STARTED; + cluster_send_session(s); + } + } + + // start IPv6 if configured and still in passive state + if (session[s].ppp.ipv6cp == Stopped) + { + sendipv6cp(s, t); + change_state(s, ipv6cp, RequestSent); + } +} + +// Process IPCP messages +void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + uint8_t b[MAXETHER]; + uint8_t *q = 0; + uint16_t hl; + + CSTAT(processipcp); + + LOG_HEX(5, "IPCP", p, l); + if (l < 4) + { + LOG(1, s, t, "Short IPCP %d bytes\n", l); + STAT(tunnel_rx_errors); + return ; + } + + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) + { + LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l); + STAT(tunnel_rx_errors); + return ; + } + l = hl; + + if (session[s].ppp.phase < Network) + { + LOG(2, s, t, "IPCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase)); + return; + } + + LOG(3, s, t, "IPCP: recv %s\n", ppp_code(*p)); + + if (*p == ConfigAck) + { + switch (session[s].ppp.ipcp) + { + case RequestSent: + initialise_restart_count(s, ipcp); + change_state(s, ipcp, AckReceived); + break; + + case AckReceived: + case Opened: + LOG(2, s, t, "IPCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipcp)); + sendipcp(s, t); + change_state(s, ipcp, RequestSent); + break; + + case AckSent: + ipcp_open(s, t); + break; + + default: + LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); + } + } + else if (*p == ConfigReq) + { + uint8_t *response = 0; + uint8_t *o = p + 4; + int length = l - 4; + int gotip = 0; + in_addr_t addr; + + while (length > 2) + { + if (!o[1] || o[1] > length) return; + + switch (*o) + { + case 3: // ip address + gotip++; // seen address + if (o[1] != 6) return; + + addr = htonl(session[s].ip); + if (memcmp(o + 2, &addr, (sizeof addr))) + { + uint8_t *oq = q; + q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); + if (!q || (q != oq && *response == ConfigRej)) + { + sessionshutdown(s, "Can't negotiate IPCP.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } + } + + break; + + case 129: // primary DNS + if (o[1] != 6) return; + + addr = htonl(session[s].dns1); + if (memcmp(o + 2, &addr, (sizeof addr))) + { + q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); + if (!q) return; + } + + break; + + case 131: // secondary DNS + if (o[1] != 6) return; + + addr = htonl(session[s].dns2); + if (memcmp(o + 2, &addr, sizeof(addr))) + { + q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); + if (!q) return; + } + + break; + + default: + LOG(2, s, t, " Rejecting PPP IPCP Option type %d\n", *o); + q = ppp_conf_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o); + if (!q) return; + } + + length -= o[1]; + o += o[1]; + } + + if (response) + { + l = q - response; // IPCP packet length + *((uint16_t *) (response + 2)) = htons(l); // update header + } + else if (gotip) + { + // Send packet back as ConfigAck + response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0); + if (!response) return; + *response = ConfigAck; + } + else + { + LOG(1, s, t, "No IP in IPCP request\n"); + STAT(tunnel_rx_errors); + return; + } + + switch (session[s].ppp.ipcp) + { + case Closed: + response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP, 0, 0, 0); + if (!response) return; + *response = TerminateAck; + *((uint16_t *) (response + 2)) = htons(l = 4); + break; + + case Stopped: + initialise_restart_count(s, ipcp); + sendipcp(s, t); + if (*response == ConfigAck) + change_state(s, ipcp, AckSent); + else + change_state(s, ipcp, RequestSent); + + break; + + case RequestSent: + if (*response == ConfigAck) + change_state(s, ipcp, AckSent); + + break; + + case AckReceived: + if (*response == ConfigAck) + ipcp_open(s, t); + + break; + + case Opened: + initialise_restart_count(s, ipcp); + sendipcp(s, t); + /* fallthrough */ + + case AckSent: + if (*response == ConfigAck) + change_state(s, ipcp, AckSent); + else + change_state(s, ipcp, RequestSent); + + break; + + default: + LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); + return; + } + + LOG(3, s, t, "IPCP: send %s\n", ppp_code(*response)); + tunnelsend(b, l + (response - b), t); + } + else if (*p == TerminateReq) + { + switch (session[s].ppp.ipcp) + { + case Closed: + case Stopped: + case Closing: + case Stopping: + case RequestSent: + case AckReceived: + case AckSent: + break; + + case Opened: + zero_restart_count(s, ipcp); + change_state(s, ipcp, Closing); + break; + + default: + LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); + return; + } + + *p = TerminateAck; // send ack + q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0); + if (!q) return; + + LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q)); + tunnelsend(b, l + (q - b), t); // send it + } + else if (*p != CodeRej) + { + ppp_code_rej(s, t, PPPIPCP, "IPCP", p, l, b, sizeof(b)); + } +} + +static void ipv6cp_open(sessionidt s, tunnelidt t) +{ + int i; + LOG(3, s, t, "IPV6CP: Opened\n"); + + change_state(s, ipv6cp, Opened); + for (i = 0; i < MAXROUTE6 && session[s].route6[i].ipv6prefixlen; i++) + { + route6set(s, session[s].route6[i].ipv6route, session[s].route6[i].ipv6prefixlen, 1); + } + + if (session[s].ipv6address.s6_addr[0]) + { + // Check if included in prefix + if (sessionbyipv6(session[s].ipv6address) != s) + route6set(s, session[s].ipv6address, 128, 1); + } + + // Send an initial RA (TODO: Should we send these regularly?) + send_ipv6_ra(s, t, NULL); +} + +// Process IPV6CP messages +void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + uint8_t b[MAXETHER]; + uint8_t *q = 0; + uint16_t hl; + + CSTAT(processipv6cp); + + LOG_HEX(5, "IPV6CP", p, l); + if (l < 4) + { + LOG(1, s, t, "Short IPV6CP %d bytes\n", l); + STAT(tunnel_rx_errors); + return ; + } + + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) + { + LOG(1, s, t, "Length mismatch IPV6CP %u/%u\n", hl, l); + STAT(tunnel_rx_errors); + return ; + } + l = hl; + + if (session[s].ppp.phase < Network) + { + LOG(2, s, t, "IPV6CP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase)); + return; + } + + LOG(3, s, t, "IPV6CP: recv %s\n", ppp_code(*p)); + + if (!session[s].ip) + { + LOG(3, s, t, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session[s].ppp.ipcp)); + return; // need IPCP to complete... + } + + if (*p == ConfigAck) + { + switch (session[s].ppp.ipv6cp) + { + case RequestSent: + initialise_restart_count(s, ipv6cp); + change_state(s, ipv6cp, AckReceived); + break; + + case AckReceived: + case Opened: + LOG(2, s, t, "IPV6CP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipv6cp)); + sendipv6cp(s, t); + change_state(s, ipv6cp, RequestSent); + break; + + case AckSent: + ipv6cp_open(s, t); + break; + + default: + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + } + } + else if (*p == ConfigReq) + { + uint8_t *response = 0; + uint8_t *o = p + 4; + int length = l - 4; + int gotip = 0; + uint32_t ident[2]; + + while (length > 2) + { + if (!o[1] || o[1] > length) return; + + switch (*o) + { + case 1: // interface identifier + gotip++; // seen address + if (o[1] != 10) return; + + if (session[s].ipv6address.s6_addr[0]) + { + // LSB 64bits of assigned IPv6 address to user (see radius attribut Framed-IPv6-Address) + memcpy(&ident[0], &session[s].ipv6address.s6_addr[8], 8); + } + else + { + ident[0] = htonl(session[s].ip); + ident[1] = 0; + } + + if (memcmp(o + 2, ident, sizeof(ident))) + { + q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, (uint8_t *)ident, sizeof(ident)); + if (!q) return; + } + + break; + + default: + LOG(2, s, t, " Rejecting PPP IPV6CP Option type %d\n", *o); + q = ppp_conf_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o); + if (!q) return; + } + + length -= o[1]; + o += o[1]; + } + + if (response) + { + l = q - response; // IPV6CP packet length + *((uint16_t *) (response + 2)) = htons(l); // update header + } + else if (gotip) + { + // Send packet back as ConfigAck + response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0); + if (!response) return; + *response = ConfigAck; + } + else + { + LOG(1, s, t, "No interface identifier in IPV6CP request\n"); + STAT(tunnel_rx_errors); + return; + } + + switch (session[s].ppp.ipv6cp) + { + case Closed: + response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP, 0, 0, 0); + if (!response) return; + *response = TerminateAck; + *((uint16_t *) (response + 2)) = htons(l = 4); + break; + + case Stopped: + initialise_restart_count(s, ipv6cp); + sendipv6cp(s, t); + if (*response == ConfigAck) + change_state(s, ipv6cp, AckSent); + else + change_state(s, ipv6cp, RequestSent); + + break; + + case RequestSent: + if (*response == ConfigAck) + change_state(s, ipv6cp, AckSent); + + break; + + case AckReceived: + if (*response == ConfigAck) + ipv6cp_open(s, t); + + break; + + case Opened: + initialise_restart_count(s, ipv6cp); + sendipv6cp(s, t); + /* fallthrough */ + + case AckSent: + if (*response == ConfigAck) + change_state(s, ipv6cp, AckSent); + else + change_state(s, ipv6cp, RequestSent); + + break; + + default: + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + return; + } + + LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*response)); + tunnelsend(b, l + (response - b), t); + } + else if (*p == TerminateReq) + { + switch (session[s].ppp.ipv6cp) + { + case Closed: + case Stopped: + case Closing: + case Stopping: + case RequestSent: + case AckReceived: + case AckSent: + break; + + case Opened: + zero_restart_count(s, ipv6cp); + change_state(s, ipv6cp, Closing); + break; + + default: + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + return; + } + + *p = TerminateAck; // send ack + q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0); + if (!q) return; + + LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*q)); + tunnelsend(b, l + (q - b), t); // send it + } + else if (*p != CodeRej) + { + ppp_code_rej(s, t, PPPIPV6CP, "IPV6CP", p, l, b, sizeof(b)); + } +} + +static void update_sessions_in_stat(sessionidt s, uint16_t l) +{ + bundleidt b = session[s].bundle; + if (!b) + { + increment_counter(&session[s].cin, &session[s].cin_wrap, l); + session[s].cin_delta += l; + session[s].pin++; + + sess_local[s].cin += l; + sess_local[s].pin++; + } + else + { + int i = frag[b].re_frame_begin_index; + int end = frag[b].re_frame_end_index; + for (;;) + { + l = frag[b].fragment[i].length; + s = frag[b].fragment[i].sid; + increment_counter(&session[s].cin, &session[s].cin_wrap, l); + session[s].cin_delta += l; + session[s].pin++; + + sess_local[s].cin += l; + sess_local[s].pin++; + if (i == end) + return; + i = (i + 1) & MAXFRAGNUM_MASK; + } + } +} + +// process IP packet received +// +// This MUST be called with at least 4 byte behind 'p'. +// (i.e. this routine writes to p[-4]). +void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + in_addr_t ip, ip_dst; + + CSTAT(processipin); + + LOG_HEX(5, "IP", p, l); + + if (l < 20) + { + LOG(1, s, t, "IP packet too short %d\n", l); + STAT(tunnel_rx_errors); + return ; + } + + ip = ntohl(*(uint32_t *)(p + 12)); + ip_dst = *(uint32_t *)(p + 16); + + if (l > MAXETHER) + { + LOG(1, s, t, "IP packet too long %d\n", l); + STAT(tunnel_rx_errors); + return ; + } + + if (session[s].ppp.phase != Network || session[s].ppp.ipcp != Opened) + return; + + if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME: + { + // no spoof (do sessionbyip to handled statically routed subnets) + if (!config->disable_no_spoof && ip != session[s].ip && sessionbyip(htonl(ip)) != s) + { + LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0)); + return; + } + } + + // run access-list if any + if (session[s].filter_in && !ip_filter(p, l, session[s].filter_in - 1)) + return; + + // adjust MSS on SYN and SYN,ACK packets with options + if ((ntohs(*(uint16_t *) (p + 6)) & 0x1fff) == 0 && p[9] == IPPROTO_TCP) // first tcp fragment + { + int ihl = (p[0] & 0xf) * 4; // length of IP header + if (l >= ihl + 20 && (p[ihl + 13] & TCP_FLAG_SYN) && ((p[ihl + 12] >> 4) > 5)) + adjust_tcp_mss(s, t, p, l, p + ihl); + } + + // Add on the tun header + p -= 4; + *(uint32_t *) p = htonl(PKTIP); + l += 4; + + if (session[s].tbf_in) + { + if (!config->no_throttle_local_IP || !sessionbyip(ip_dst)) + { + // Are we throttling this session? + if (config->cluster_iam_master) + tbf_queue_packet(session[s].tbf_in, p, l); + else + master_throttle_packet(session[s].tbf_in, p, l); + return; + } + } + + // send to ethernet + if (tun_write(p, l) < 0) + { + STAT(tun_tx_errors); + LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n", + l, strerror(errno), tunfd, p); + + return; + } + + p += 4; + l -= 4; if (session[s].snoop_ip && session[s].snoop_port) { - // Snooping this session, send it to ASIO - snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port); + // Snooping this session + snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port); + } + + update_sessions_in_stat(s, l); + + eth_tx += l; + + STAT(tun_tx_packets); + INC_STAT(tun_tx_bytes, l); +} + +// process Multilink PPP packet received +void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + bundleidt b = session[s].bundle; + bundlet * this_bundle = &bundle[b]; + uint32_t maskSeq, max_seq; + int frag_offset; + uint16_t frag_index, frag_index_next, frag_index_prev; + fragmentationt *this_fragmentation = &frag[b]; + uint8_t begin_frame = (*p & MP_BEGIN); + uint8_t end_frame = (*p & MP_END); + uint32_t seq_num, seq_num_next, seq_num_prev; + uint32_t i; + uint8_t flags = *p; + uint16_t begin_index, end_index; + + // Perform length checking + if(l > MAXFRAGLEN) + { + LOG(2, s, t, "MPPP: discarding fragment larger than MAXFRAGLEN\n"); + return; + } + + if(!b) + { + LOG(2, s, t, "MPPP: Invalid bundle id: 0\n"); + return; + } + // FIXME !! session[s].mssf means that the receiver wants to receive frames in mssf not means the receiver will send frames in mssf + /* if(session[s].mssf) + { + // Get 12 bit for seq number + seq_num = ntohs((*(uint16_t *) p) & 0xFF0F); + p += 2; + l -= 2; + // After this point the pointer should be advanced 2 bytes + LOG(3, s, t, "MPPP: 12 bits, sequence number: %d\n",seq_num); + } + else */ + { + // Get 24 bit for seq number + seq_num = ntohl((*(uint32_t *) p) & 0xFFFFFF00); + p += 4; + l -= 4; + // After this point the pointer should be advanced 4 bytes + LOG(4, s, t, "MPPP: 24 bits sequence number:%d\n",seq_num); + } + + max_seq = this_bundle->max_seq; + maskSeq = max_seq - 1; + + /* + * Expand sequence number to 32 bits, making it as close + * as possible to this_fragmentation->M. + */ + seq_num |= this_fragmentation->M & ~maskSeq; + if ((int)(this_fragmentation->M - seq_num) > (int)(maskSeq >> 1)) + { + seq_num += maskSeq + 1; + } + else if ((int)(seq_num - this_fragmentation->M) > (int)(maskSeq >> 1)) + { + seq_num -= maskSeq + 1; /* should never happen */ + } + + // calculate this fragment's offset from the begin seq in the bundle + frag_offset = (int) (seq_num - this_fragmentation->start_seq); + + sess_local[s].last_seq = seq_num; + + // calculate the jitter average + uint32_t ljitter = time_now_ms - sess_local[s].prev_time; + if (ljitter > 0) + { + sess_local[s].jitteravg = (sess_local[s].jitteravg + ljitter)>>1; + sess_local[s].prev_time = time_now_ms; + } + + uint32_t Mmin; + + if (seq_num < this_fragmentation->M) + { + Mmin = seq_num; + this_fragmentation->M = seq_num; + } + else + { + Mmin = sess_local[(this_bundle->members[0])].last_seq; + for (i = 1; i < this_bundle->num_of_links; i++) + { + uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq; + if (s_seq < Mmin) + Mmin = s_seq; + } + this_fragmentation->M = Mmin; + } + + // calculate M offset of the M seq in the bundle + int M_offset = (int) (Mmin - this_fragmentation->start_seq); + + if (M_offset >= MAXFRAGNUM) + { + // There have a long break of the link !!!!!!!! + // M_offset is bigger that the fragmentation buffer size + LOG(3, s, t, "MPPP: M_offset out of range, min:%d, begin_seq:%d\n", Mmin, this_fragmentation->start_seq); + + // Calculate the new start index, the previous frag are lost + begin_index = (M_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK; + + // Set new Start sequence + this_fragmentation->start_index = begin_index; + this_fragmentation->start_seq = Mmin; + M_offset = 0; + // recalculate the fragment offset from the new begin seq in the bundle + frag_offset = (int) (seq_num - Mmin); + } + + // discard this fragment if the packet comes before the start sequence + if (frag_offset < 0) + { + // this packet comes before the next + LOG(3, s, t, "MPPP: (COMES BEFORE) the next, seq:%d, begin_seq:%d, size_frag:%d, flags:%02X is LOST\n", seq_num, this_fragmentation->start_seq, l, flags); + return; + } + + // discard if frag_offset is bigger that the fragmentation buffer size + if (frag_offset >= MAXFRAGNUM) + { + // frag_offset is bigger that the fragmentation buffer size + LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d\n", seq_num, this_fragmentation->start_seq); + return; + } + + //caculate received fragment's index in the fragment array + frag_index = (frag_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK; + + // insert the frame in it's place + fragmentt *this_frag = &this_fragmentation->fragment[frag_index]; + + if (this_frag->length > 0) + // This fragment is lost, It was around the buffer and it was never completed the packet. + LOG(3, this_frag->sid, this_frag->tid, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%02X is LOST\n", + this_frag->seq, frag_index, this_frag->flags); + + this_frag->length = l; + this_frag->sid = s; + this_frag->tid = t; + this_frag->flags = flags; + this_frag->seq = seq_num; + this_frag->jitteravg = sess_local[s].jitteravg; + memcpy(this_frag->data, p, l); + + LOG(4, s, t, "MPPP: seq_num:%d frag_index:%d INSERTED flags: %02X\n", seq_num, frag_index, flags); + + //next frag index + frag_index_next = (frag_index + 1) & MAXFRAGNUM_MASK; + //previous frag index + frag_index_prev = (frag_index - 1) & MAXFRAGNUM_MASK; + // next seq + seq_num_next = seq_num + 1; + // previous seq + seq_num_prev = seq_num - 1; + + // Clean the buffer and log the lost fragments + if ((frag_index_next != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_next].length) + { + // check if the next frag is a lost fragment + if (this_fragmentation->fragment[frag_index_next].seq != seq_num_next) + { + // This fragment is lost, It was around the buffer and it was never completed the packet. + LOG(3, this_fragmentation->fragment[frag_index_next].sid, this_fragmentation->fragment[frag_index_next].tid, + "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%02X is LOST\n", + this_fragmentation->fragment[frag_index_next].seq, frag_index_next, + this_fragmentation->fragment[frag_index_next].flags); + // this frag is lost + this_fragmentation->fragment[frag_index_next].length = 0; + this_fragmentation->fragment[frag_index_next].flags = 0; + + if (begin_frame && (!end_frame)) return; // assembling frame failed + } + } + + // Clean the buffer and log the lost fragments + if ((frag_index != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_prev].length) + { + // check if the next frag is a lost fragment + if (this_fragmentation->fragment[frag_index_prev].seq != seq_num_prev) + { + // This fragment is lost, It was around the buffer and it was never completed the packet. + LOG(3, this_fragmentation->fragment[frag_index_prev].sid, this_fragmentation->fragment[frag_index_prev].tid, + "MPPP: (PREV) seq_num:%d frag_index:%d flags:%02X is LOST\n", + this_fragmentation->fragment[frag_index_prev].seq, frag_index_prev, + this_fragmentation->fragment[frag_index_prev].flags); + + this_fragmentation->fragment[frag_index_prev].length = 0; + this_fragmentation->fragment[frag_index_prev].flags = 0; + + if (end_frame && (!begin_frame)) return; // assembling frame failed + } + } + +find_frame: + begin_index = this_fragmentation->start_index; + uint32_t b_seq = this_fragmentation->start_seq; + // Try to find a Begin sequence from the start_seq sequence to M sequence + while (b_seq < Mmin) + { + if (this_fragmentation->fragment[begin_index].length) + { + if (b_seq == this_fragmentation->fragment[begin_index].seq) + { + if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN) + { + int isfoundE = 0; + // Adjust the new start sequence and start index + this_fragmentation->start_index = begin_index; + this_fragmentation->start_seq = b_seq; + // Begin Sequence found, now try to found the End Sequence to complete the frame + end_index = begin_index; + while (b_seq < Mmin) + { + if (this_fragmentation->fragment[end_index].length) + { + if (b_seq == this_fragmentation->fragment[end_index].seq) + { + if (this_fragmentation->fragment[end_index].flags & MP_END) + { + // The End sequence was found and the frame is complete + isfoundE = 1; + break; + } + } + else + { + // This fragment is lost, it was never completed the packet. + LOG(3, this_fragmentation->fragment[end_index].sid, this_fragmentation->fragment[end_index].tid, + "MPPP: (FIND END) seq_num:%d frag_index:%d flags:%02X is LOST\n", + this_fragmentation->fragment[end_index].seq, begin_index, + this_fragmentation->fragment[end_index].flags); + // this frag is lost + this_fragmentation->fragment[end_index].length = 0; + this_fragmentation->fragment[end_index].flags = 0; + // This frame is not complete find the next Begin + break; + } + } + else + { + // This frame is not complete find the next Begin if exist + break; + } + end_index = (end_index +1) & MAXFRAGNUM_MASK; + b_seq++; + } + + if (isfoundE) + // The End sequence was found and the frame is complete + break; + else + // find the next Begin + begin_index = end_index; + } + } + else + { + // This fragment is lost, it was never completed the packet. + LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid, + "MPPP: (FIND BEGIN) seq_num:%d frag_index:%d flags:%02X is LOST\n", + this_fragmentation->fragment[begin_index].seq, begin_index, + this_fragmentation->fragment[begin_index].flags); + // this frag is lost + this_fragmentation->fragment[begin_index].length = 0; + this_fragmentation->fragment[begin_index].flags = 0; + } + } + begin_index = (begin_index +1) & MAXFRAGNUM_MASK; + b_seq++; + } + +assembling_frame: + // try to assemble the frame that has the received fragment as a member + // get the beginning of this frame + begin_index = end_index = this_fragmentation->start_index; + if (this_fragmentation->fragment[begin_index].length) + { + if (!(this_fragmentation->fragment[begin_index].flags & MP_BEGIN)) + { + LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid, + "MPPP: (NOT BEGIN) seq_num:%d frag_index:%d flags:%02X\n", + this_fragmentation->fragment[begin_index].seq, begin_index, + this_fragmentation->fragment[begin_index].flags); + // should occur only after an "M_Offset out of range" + // The start sequence must be a begin sequence + this_fragmentation->start_index = (begin_index +1) & MAXFRAGNUM_MASK; + this_fragmentation->start_seq++; + return; // assembling frame failed + } + } + else + return; // assembling frame failed + + // get the end of his frame + while (this_fragmentation->fragment[end_index].length) + { + if (this_fragmentation->fragment[end_index].flags & MP_END) + break; + + end_index = (end_index +1) & MAXFRAGNUM_MASK; + + if (end_index == this_fragmentation->start_index) + return; // assembling frame failed + } + + // return if a lost fragment is found + if (!(this_fragmentation->fragment[end_index].length)) + return; // assembling frame failed + + // assemble the packet + //assemble frame, process it, reset fragmentation + uint16_t cur_len = 4; // This is set to 4 to leave 4 bytes for function processipin + + LOG(4, s, t, "MPPP: processing fragments from %d to %d\n", begin_index, end_index); + // Push to the receive buffer + + for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK) + { + this_frag = &this_fragmentation->fragment[i]; + if(cur_len + this_frag->length > MAXETHER) + { + LOG(2, s, t, "MPPP: discarding reassembled frames larger than MAXETHER\n"); + break; + } + + memcpy(this_fragmentation->reassembled_frame+cur_len, this_frag->data, this_frag->length); + LOG(5, s, t, "MPPP: processing frame at %d, with len %d\n", i, this_frag->length); + + cur_len += this_frag->length; + if (i == end_index) + { + this_fragmentation->re_frame_len = cur_len; + this_fragmentation->re_frame_begin_index = begin_index; + this_fragmentation->re_frame_end_index = end_index; + // Process the resassembled frame + LOG(5, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len); + processmpframe(s, t, this_fragmentation->reassembled_frame, this_fragmentation->re_frame_len, 1); + break; + } + } + + // Set reassembled frame length to zero after processing it + this_fragmentation->re_frame_len = 0; + for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK) + { + this_fragmentation->fragment[i].length = 0; // Indicates that this fragment has been consumed + this_fragmentation->fragment[i].flags = 0; + if (i == end_index) + break; + } + + // Set the new start_index and start_seq + this_fragmentation->start_index = (end_index + 1) & MAXFRAGNUM_MASK; + this_fragmentation->start_seq = this_fragmentation->fragment[end_index].seq + 1; + LOG(4, s, t, "MPPP after assembling: start index is = %d, start seq=%d\n", this_fragmentation->start_index, this_fragmentation->start_seq); + + begin_index = this_fragmentation->start_index; + if ((this_fragmentation->fragment[begin_index].length) && + (this_fragmentation->fragment[begin_index].seq != this_fragmentation->start_seq)) + { + LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid, + "MPPP: (START) seq_num:%d frag_index:%d flags:%02X is LOST\n", + this_fragmentation->fragment[begin_index].seq, begin_index, + this_fragmentation->fragment[begin_index].flags); + this_fragmentation->fragment[begin_index].length = 0; + this_fragmentation->fragment[begin_index].flags = 0; + } + + if (this_fragmentation->start_seq <= Mmin) + // It's possible to find other complete frame or lost frame. + goto find_frame; + else if ((this_fragmentation->fragment[begin_index].length) && + (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)) + // may be that the next frame is completed + goto assembling_frame; + + return; +} + +// process IPv6 packet received +// +// This MUST be called with at least 4 byte behind 'p'. +// (i.e. this routine writes to p[-4]). +void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + struct in6_addr ip; + in_addr_t ipv4; + + CSTAT(processipv6in); + + LOG_HEX(5, "IPv6", p, l); + + ip = *(struct in6_addr *) (p + 8); + ipv4 = ntohl(*(uint32_t *)(p + 16)); + + if (l > MAXETHER) + { + LOG(1, s, t, "IP packet too long %d\n", l); + STAT(tunnel_rx_errors); + return ; + } + + if (session[s].ppp.phase != Network || session[s].ppp.ipv6cp != Opened) + return; + + // no spoof + if (session[s].ipv6address.s6_addr[0]) + { + if ((sessionbyipv6new(ip) != s) && + (ip.s6_addr[0] != 0xFE || ip.s6_addr[1] != 0x80 || ip.s6_addr16[1] != 0 || ip.s6_addr16[2] != 0 || ip.s6_addr16[3] != 0)) + { + char str[INET6_ADDRSTRLEN]; + LOG(5, s, t, "Dropping packet with spoofed IP %s\n", + inet_ntop(AF_INET6, &ip, str, INET6_ADDRSTRLEN)); + return; + } + } + else if ((ipv4 != session[s].ip || memcmp(&config->ipv6_prefix, &ip, 8)) && sessionbyipv6(ip) != s) + { + char str[INET6_ADDRSTRLEN]; + LOG(5, s, t, "Dropping packet with spoofed IP %s\n", + inet_ntop(AF_INET6, &ip, str, INET6_ADDRSTRLEN)); + return; + } + + // Check if it's a Router Solicition message. + if (*(p + 6) == 58 && *(p + 7) == 255 && *(p + 24) == 0xFF && *(p + 25) == 2 && + *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 && + *(uint32_t *)(p + 34) == 0 && + *(p + 38) == 0 && *(p + 39) == 2 && *(p + 40) == 133) { + LOG(3, s, t, "Got IPv6 RS\n"); + send_ipv6_ra(s, t, &ip); + return; + } + + // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547) + if (*(p + 6) == 17 && *(p + 24) == 0xFF && *(p + 25) == 2 && + *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 && + *(uint16_t *)(p + 34) == 0 && *(p + 36) == 0 && *(p + 37) == 1 && *(p + 38) == 0 && *(p + 39) == 2 && + *(p + 40) == 2 && *(p + 41) == 0x22 && *(p + 42) == 2 && *(p + 43) == 0x23) + { + dhcpv6_process(s, t, p, l); + return; + } + + // Add on the tun header + p -= 4; + *(uint32_t *) p = htonl(PKTIPV6); + l += 4; + + // Are we throttled and a slave? + if (session[s].tbf_in && !config->cluster_iam_master) { + // Pass it to the master for handling. + master_throttle_packet(session[s].tbf_in, p, l); + return; } - STAT(tap_tx_packets); - INC_STAT(tap_tx_bytes, l); - if (session[s].tbf_in && config->cluster_iam_master) { // Are we throttled and a master?? actually handle the throttled packets. + // Are we throttled and a master?? + if (session[s].tbf_in && config->cluster_iam_master) { + // Actually handle the throttled packets. tbf_queue_packet(session[s].tbf_in, p, l); return; } @@ -634,195 +2326,542 @@ void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l) // send to ethernet if (tun_write(p, l) < 0) { - STAT(tap_tx_errors); - log(0, 0, s, t, "Error writing %d bytes to TAP device: %s (tapfd=%d, p=%p)\n", - l, strerror(errno), tapfd, p); + STAT(tun_tx_errors); + LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n", + l, strerror(errno), tunfd, p); + + return; + } + + p += 4; + l -= 4; + + if (session[s].snoop_ip && session[s].snoop_port) + { + // Snooping this session + snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port); } + update_sessions_in_stat(s, l); + + eth_tx += l; + + STAT(tun_tx_packets); + INC_STAT(tun_tx_bytes, l); } // // Helper routine for the TBF filters. // Used to send queued data in from the user. // -void send_ipin(sessionidt s, u8 *buf, int len) +void send_ipin(sessionidt s, uint8_t *buf, int len) { - log_hex(5, "IP in throttled", buf, len); - if (write(tapfd, buf, len) < 0) + LOG_HEX(5, "IP in throttled", buf, len); + + if (write(tunfd, buf, len) < 0) { - STAT(tap_tx_errors); - log(0, 0, 0, 0, "Error writing %d bytes to TAP device: %s (tapfd=%d, p=%p)\n", - len, strerror(errno), tapfd, buf); + STAT(tun_tx_errors); + LOG(0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n", + len, strerror(errno), tunfd, buf); + + return; } - // Increment packet counters - session[s].cin += len - 4; - session[s].total_cin += len - 4; - sess_count[s].cin += len - 4; + buf += 4; + len -= 4; + if (session[s].snoop_ip && session[s].snoop_port) + { + // Snooping this session + snoop_send_packet(buf, len, session[s].snoop_ip, session[s].snoop_port); + } + + // Increment packet counters + increment_counter(&session[s].cin, &session[s].cin_wrap, len); + session[s].cin_delta += len; session[s].pin++; - eth_tx += len - 4; + + sess_local[s].cin += len; + sess_local[s].pin++; + + eth_tx += len; + + STAT(tun_tx_packets); + INC_STAT(tun_tx_bytes, len - 4); } -// Process LCP messages -void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l) +// Process CCP messages +void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { + uint8_t b[MAXETHER]; + uint8_t *q; + + CSTAT(processccp); - CSTAT(call_processccp); + LOG_HEX(5, "CCP", p, l); + + if (session[s].ppp.phase < Network) + { + LOG(2, s, t, "CCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase)); + return; + } - log_hex(5, "CCP", p, l); - if (l < 2 || (*p != ConfigReq && *p != TerminateReq)) + if (l < 1) { - log(1, 0, s, t, "Unexpecetd CCP request code %d\n", *p); + LOG(1, s, t, "Short CCP packet\n"); STAT(tunnel_rx_errors); - return ; } - // reject + + LOG(4, s, t, "CCP: recv %s\n", ppp_code(*p)); + if (*p == ConfigAck) + { + switch (session[s].ppp.ccp) + { + case RequestSent: + initialise_restart_count(s, ccp); + change_state(s, ccp, AckReceived); + break; + + case AckReceived: + case Opened: + LOG(2, s, t, "CCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ccp)); + sendccp(s, t); + change_state(s, ccp, RequestSent); + break; + + case AckSent: + LOG(3, s, t, "CCP: Opened\n"); + change_state(s, ccp, Opened); + break; + + default: + LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp)); + } + } + else if (*p == ConfigReq) { - u8 b[MAXCONTROL]; - u8 *q; - if (*p == ConfigReq) + if (l < 6) // accept no compression + *p = ConfigAck; + else // compression requested--reject + *p = ConfigRej; + + q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0); + if (!q) return; + + switch (session[s].ppp.ccp) { - if (l < 6) - { - *p = ConfigAck; // accept no compression - } + case Closed: + q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP, 0, 0, 0); + if (!q) return; + *q = TerminateAck; + *((uint16_t *) (q + 2)) = htons(l = 4); + break; + + case Stopped: + initialise_restart_count(s, ccp); + sendccp(s, t); + if (*q == ConfigAck) + change_state(s, ccp, AckSent); else - { - *p = ConfigRej; // reject - } - } - else - *p = TerminateAck; // close - q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP); - if (!q) { - log(1,0,0,0, "Failed to send CCP packet.\n"); + change_state(s, ccp, RequestSent); + + break; + + case RequestSent: + if (*q == ConfigAck) + change_state(s, ccp, AckSent); + + break; + + case AckReceived: + if (*q == ConfigAck) + change_state(s, ccp, Opened); + + break; + + case Opened: + initialise_restart_count(s, ccp); + sendccp(s, t); + /* fallthrough */ + + case AckSent: + if (*q == ConfigAck) + change_state(s, ccp, AckSent); + else + change_state(s, ccp, RequestSent); + + break; + + default: + LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp)); return; } - tunnelsend(b, l + (q - b), t); // send it + + LOG(4, s, t, "CCP: send %s\n", ppp_code(*q)); + tunnelsend(b, l + (q - b), t); + } + else if (*p == TerminateReq) + { + *p = TerminateAck; + q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0); + if (!q) return; + LOG(3, s, t, "CCP: send %s\n", ppp_code(*q)); + tunnelsend(b, l + (q - b), t); + change_state(s, ccp, Stopped); + } + else if (*p != CodeRej) + { + ppp_code_rej(s, t, PPPCCP, "CCP", p, l, b, sizeof(b)); } } -// send a CHAP PP packet -void sendchap(tunnelidt t, sessionidt s) +// send a CHAP challenge +void sendchap(sessionidt s, tunnelidt t) { - u8 b[MAXCONTROL]; - u16 r = session[s].radius; - u8 *q; + uint8_t b[MAXETHER]; + uint16_t r; + uint8_t *q; - CSTAT(call_sendchap); + CSTAT(sendchap); + r = radiusnew(s); if (!r) { - log(1, 0, s, t, "No RADIUS to send challenge\n"); + LOG(1, s, t, "No RADIUS to send challenge\n"); STAT(tunnel_tx_errors); - return ; - } - log(1, 0, s, t, "Send CHAP challenge\n"); - { // new challenge - int n; - for (n = 0; n < 15; n++) - radius[r].auth[n] = rand(); + return; } - radius[r].chap = 1; // CHAP not PAP + + LOG(1, s, t, "Send CHAP challenge\n"); + + radius[r].chap = 1; // CHAP not PAP radius[r].id++; if (radius[r].state != RADIUSCHAP) radius[r].try = 0; + radius[r].state = RADIUSCHAP; radius[r].retry = backoff(radius[r].try++); if (radius[r].try > 5) { - sessionshutdown(s, "Timeout CHAP"); + sessionshutdown(s, "CHAP timeout.", CDN_ADMIN_DISC, TERM_REAUTHENTICATION_FAILURE); STAT(tunnel_tx_errors); return ; } - q = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP); - if (!q) { - log(1, 0, s, t, "failed to send CHAP challenge.\n"); - return; - } - *q = 1; // challenhe - q[1] = radius[r].id; // ID - q[4] = 16; // length - memcpy(q + 5, radius[r].auth, 16); // challenge - strcpy(q + 21, hostname); // our name - *(u16 *) (q + 2) = htons(strlen(hostname) + 21); // length - tunnelsend(b, strlen(hostname) + 21 + (q - b), t); // send it + q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0); + if (!q) return; + + *q = 1; // challenge + q[1] = radius[r].id; // ID + q[4] = 16; // value size (size of challenge) + memcpy(q + 5, radius[r].auth, 16); // challenge + strcpy((char *) q + 21, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname); // our name + *(uint16_t *) (q + 2) = htons(strlen(config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname) + 21); // length + tunnelsend(b, strlen(config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname) + 21 + (q - b), t); // send it } // fill in a L2TP message with a PPP frame, -// copies existing PPP message and changes magic number if seen // returns start of PPP frame -u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype) +uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits) { + uint16_t hdr = 0x0002; // L2TP with no options + uint16_t type = mtype; + uint8_t *start = b; + + if (t == TUNNEL_ID_PPPOE) + { + return pppoe_makeppp(b, size, p, l, s, t, mtype, prio, bid, mp_bits); + } + + if (size < 16) // Need more space than this!! + { + LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size); + return NULL; + } - if (size < 12) - return NULL; // Need more space than this!! + if (prio) hdr |= 0x0100; // set priority bit - *(u16 *) (b + 0) = htons(0x0002); // L2TP with no options - *(u16 *) (b + 2) = htons(tunnel[t].far); // tunnel - *(u16 *) (b + 4) = htons(session[s].far); // session + *(uint16_t *) (b + 0) = htons(hdr); + *(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel + *(uint16_t *) (b + 4) = htons(session[s].far); // session b += 6; - if (mtype != PPPLCP && !(session[s].l2tp_flags & SESSIONACFC)) + + // Check whether this session is part of multilink + if (bid) + { + if (bundle[bid].num_of_links > 1) + type = PPPMP; // Change PPP message type to the PPPMP + else + bid = 0; + } + + if (type == PPPLCP || !(session[s].flags & SESSION_ACFC)) { - *(u16 *) b = htons(0xFF03); // HDLC header + *(uint16_t *) b = htons(0xFF03); // HDLC header b += 2; } - if (mtype < 0x100 && session[s].l2tp_flags & SESSIONPFC) - *b++ = mtype; + + if (type < 0x100 && session[s].flags & SESSION_PFC) + { + *b++ = type; + } else { - *(u16 *) b = htons(mtype); + *(uint16_t *) b = htons(type); b += 2; } - if (l + 12 > size) { - log(3,0,0,0, "Would have overflowed the buffer in makeppp: size %d, len %d.\n", size, l); - return NULL; // Run out of room to hold the packet! + if (bid) + { + // Set the sequence number and (B)egin (E)nd flags + if (session[s].mssf) + { + // Set the multilink bits + uint16_t bits_send = mp_bits; + *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send); + b += 2; + } + else + { + *(uint32_t *) b = htonl(bundle[bid].seq_num_t); + // Set the multilink bits + *b = mp_bits; + b += 4; + } + + bundle[bid].seq_num_t++; + + // Add the message type if this fragment has the begin bit set + if (mp_bits & MP_BEGIN) + { + //*b++ = mtype; // The next two lines are instead of this + *(uint16_t *) b = htons(mtype); // Message type + b += 2; + } + } + + if ((b - start) + l > size) + { + LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%td)\n", size, (b - start) + l); + return NULL; } + + // Copy the payload if (p && l) memcpy(b, p, l); + return b; } -// find a PPP option, returns point to option, or 0 if not found -u8 *findppp(u8 * b, u8 mtype) +// fill in a L2TP message with a PPP frame, +// returns start of PPP frame +//(note: THIS ROUTINE CAN WRITES TO p[-28]). +uint8_t *opt_makeppp(uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits) { - u16 l = ntohs(*(u16 *) (b + 2)); - if (l < 4) + uint16_t hdr = 0x0002; // L2TP with no options + uint16_t type = mtype; + uint8_t *b = p; + + if (t == TUNNEL_ID_PPPOE) + { + return opt_pppoe_makeppp(p, l, s, t, mtype, prio, bid, mp_bits); + } + + // Check whether this session is part of multilink + if (bid) + { + if (bundle[bid].num_of_links > 1) + type = PPPMP; // Change PPP message type to the PPPMP + else + bid = 0; + } + + if (bid) + { + // Add the message type if this fragment has the begin bit set + if (mp_bits & MP_BEGIN) + { + b -= 2; + *(uint16_t *) b = htons(mtype); // Message type + } + + // Set the sequence number and (B)egin (E)nd flags + if (session[s].mssf) + { + // Set the multilink bits + uint16_t bits_send = mp_bits; + b -= 2; + *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send); + } + else + { + b -= 4; + *(uint32_t *) b = htonl(bundle[bid].seq_num_t); + // Set the multilink bits + *b = mp_bits; + } + + bundle[bid].seq_num_t++; + } + + if (type < 0x100 && session[s].flags & SESSION_PFC) + { + b--; + *b = type; + } + else + { + b -= 2; + *(uint16_t *) b = htons(type); + } + + if (type == PPPLCP || !(session[s].flags & SESSION_ACFC)) + { + b -= 2; + *(uint16_t *) b = htons(0xFF03); // HDLC header + } + + if (prio) hdr |= 0x0100; // set priority bit + b -= 2; + *(uint16_t *) b = htons(session[s].far); // session + b -= 2; + *(uint16_t *) b = htons(tunnel[t].far); // tunnel + b -= 2; + *(uint16_t *) b = htons(hdr); + + return b; +} + +static int add_lcp_auth(uint8_t *b, int size, int authtype) +{ + int len = 0; + if ((authtype == AUTHCHAP && size < 5) || size < 4) return 0; - b += 4; - l -= 4; - while (l) + + *b++ = 3; // Authentication-Protocol + if (authtype == AUTHCHAP) { - if (l < b[1] || !b[1]) - return 0; // faulty - if (*b == mtype) - return b; - l -= b[1]; - b += b[1]; + len = *b++ = 5; // length + *(uint16_t *) b = htons(PPPCHAP); b += 2; + *b++ = 5; // MD5 } - return 0; + else if (authtype == AUTHPAP) + { + len = *b++ = 4; // length + *(uint16_t *) b = htons(PPPPAP); b += 2; + } + else + { + LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype); + } + + return len; } -// Send initial LCP ConfigReq -void initlcp(tunnelidt t, sessionidt s) +// Send LCP ConfigReq for MRU, authentication type and magic no +void sendlcp(sessionidt s, tunnelidt t) { - char b[500] = {0}, *q; + uint8_t b[500], *q, *l; + int authtype = sess_local[s].lcp_authtype; - q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP); - if (!q) { - log(1, 0, s, t, "Failed to send LCP ConfigReq.\n"); + if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP, 0, 0, 0))) return; + + LOG(3, s, t, "LCP: send ConfigReq%s%s%s including MP options\n", + authtype ? " (" : "", + authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "", + authtype ? ")" : ""); + + l = q; + *l++ = ConfigReq; + *l++ = ++sess_local[s].lcp_ident; // ID + + l += 2; //Save space for length + + if (sess_local[s].ppp_mru) + { + *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4) + *(uint16_t *) l = htons(sess_local[s].ppp_mru); l += 2; + } + + if (authtype) + l += add_lcp_auth(l, sizeof(b) - (l - b), authtype); + + if (session[s].magic) + { + *l++ = 5; *l++ = 6; // Magic-Number (length 6) + *(uint32_t *) l = htonl(session[s].magic); + l += 4; } - log(4, 0, s, t, "Sending LCP ConfigReq for PAP\n"); + + if (sess_local[s].mp_mrru) + { + *l++ = 17; *l++ = 4; // Multilink Max-Receive-Reconstructed-Unit (length 4) + *(uint16_t *) l = htons(sess_local[s].mp_mrru); l += 2; + } + + if (sess_local[s].mp_epdis) + { + *l++ = 19; *l++ = 7; // Multilink Endpoint Discriminator (length 7) + *l++ = IPADDR; // Endpoint Discriminator class + *(uint32_t *) l = htonl(sess_local[s].mp_epdis); + l += 4; + } + + *(uint16_t *)(q + 2) = htons(l - q); // Length + + LOG_HEX(5, "PPPLCP", q, l - q); + if (config->debug > 3) dumplcp(q, l - q); + + tunnelsend(b, (l - b), t); + restart_timer(s, lcp); +} + +// Send CCP request for no compression +void sendccp(sessionidt s, tunnelidt t) +{ + uint8_t b[500], *q; + + if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP, 0, 0, 0))) + return; + + LOG(3, s, t, "CCP: send ConfigReq (no compression)\n"); + *q = ConfigReq; - *(u8 *)(q + 1) = (time_now % 255) + 1; // ID - *(u16 *)(q + 2) = htons(8); // Length - *(u8 *)(q + 4) = 3; - *(u8 *)(q + 5) = 4; - *(u16 *)(q + 6) = htons(0xC023); // PAP - tunnelsend(b, 12 + 8, t); + *(q + 1) = ++sess_local[s].lcp_ident; // ID + *(uint16_t *)(q + 2) = htons(4); // Length + + LOG_HEX(5, "PPPCCP", q, 4); + tunnelsend(b, (q - b) + 4 , t); + restart_timer(s, ccp); } +// Reject unknown/unconfigured protocols +void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto) +{ + + uint8_t buf[MAXETHER]; + uint8_t *q; + int mru = session[s].mru; + if (mru < MINMTU) mru = MINMTU; + if (mru > sizeof(buf)) mru = sizeof(buf); + + l += 6; + if (l > mru) l = mru; + + q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP, 0, 0, 0); + if (!q) return; + + *q = ProtocolRej; + *(q + 1) = ++sess_local[s].lcp_ident; + *(uint16_t *)(q + 2) = htons(l); + *(uint16_t *)(q + 4) = htons(proto); + memcpy(q + 6, p, l - 6); + + if (proto == PPPIPV6CP) + LOG(3, s, t, "LCP: send ProtocolRej (IPV6CP: not configured)\n"); + else + LOG(2, s, t, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto); + + tunnelsend(buf, l + (q - buf), t); +}